There have to be some good adult movie theatre/book stores in Charlotte. They usually advertise in the alternative magazine found in the downtown area.
A word of warning, it is not always safe to engage in sexual activity in these booths. In San Diego the vice squad makes a habit of both doing routine inspections where they have the employees open the doors and they do sting operations targeting any sexual activity including masturbation. I think it started to control homosexual activity but now days anyone will be cited with a misdemeanor (a conviction can result in registration as a sex offender).
I don't want to ruin the fantasy, but be careful!